drm/i915: Implement read-only support in whitelist selftest
Newer hardware supports extra feature in the whitelist registers. This patch updates the selftest to test that entries marked as read only are actually read only. v2: Removed all use of 'rsvd' for read-only registers to avoid ambiguous code or error messages. Signed-off-by: NJohn Harrison <John.C.Harrison@Intel.com> CC: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190712070745.35239-3-John.C.Harrison@Intel.com
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